Allix, You may have a damaged disk so if you have any valuable data on it, you might be best taking it to someone who knows what to do rather than relying on my feedback from this site as I can't actually

Hi Allix, I hope I can help. As you're successful in booting into Knoppix, can you see anything on the Knoppix desktop called, "Hard Disk Partition [hda1]" or "Hard Disk Partition [sda1]"? Try browsing